I have heard of a British device that attaches to a standard stick welder. It does spot-welds from one side. Don't know the name or manufacturer. It was mentioned in my AH resto book. Don't know how it worked, either, but being able to spot weld without access to the blind side must be easier than even plug welding.
Current fleet (subject to change w/o notice) \'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run. My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787. Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
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